Improvement in bolt-heading machines



OFFICE.

THOMAS HULL AND NICHOLAS THOMAS, OF CHICAGO, ILLINOIS.

IMPROVEMENT IN BOLT-HEADING MACHINES.

Specification forming part of' Letters Patent No. 112,248, dated February 28, 1871.

To all whom it may concern:

Be it known that we, THOMAS HULL and NICHOLAS THOMAS, of Chicago, iu the county of Cook and State ot' Illinois, have invented certain new and useful Improvements in Machines for Making and Heading Bolts; and

we do `hereby declare .the following to be a full, clear, and vexact description thereof, which will enable others skilled in the art to which our invention appertains to make and y use thesame, reference being had to the accompanying drawing, forming part of this specification, in whicl1 4 Figure 1, Plate l, is a side elevation, showf ing those parts of the 4machine which are at the `left hand in Fig. 2. Fig. 2, Plate 2, is an end view of the same. Fig. 3,1Plate 2, is a side elevation, showing those parts of the mai chine which are at the right hand in Fig. 2.

Fig. 4, Plate 2, is a vertical longitudinal central section of the press employed in operating4 theheading-tool; and Fig.'5, Plate 1, is a `vertical transverse` section ot' the dies emi ployed in shapingthe bolt-head.

Similar letters of reference indicate correspending parts in the several gures of the drawing.

The `object of our invention is' to provide a mechanical device by the use of which the` end ofthe bolt may be upset and pressed to any desired shape, whereby the head is formed upon the same and thenature of our improvement consists, first, in the employment of a hydraulic press lfor operating the headingtool 5 and, second, in the dies which form the `bolt-head, and the manner of operating the saine, a description of which will be hereinafter more fully given.

y In the accompanying drawing, A is the frame of the machine, and B themain or driving shaft. Said shaft is extended across from side to side of the frame, and provided on its outer end with a gearlwheel, C, which engages with a gear-pinion, C2, to Which power is applied or operating the moving parts of the machine.` Fixed upon said shaft B` is a cam,

' D, which comes in contact with or against a buckle-jointed lever, E, the lower end of which is hinged to the lower portion of the frame, and at the upper end to the lower end of guide F, securedto plunger G of the pump.

Saidguide is dovetailed to and moves upon a vertical guide or Way, h, secured to the main frame.

Attached and firmly secured to the central portion or partition, A2, of frame A is a hy A `municates with the press by means of an aperture, a, cut through the upper surface of the cylinder of the same. The orifice of said aperture is "pravided with an escape-valve, d, the

shank of which is socket-jointed to the valvei stem e. Said valve-stem extends upward, and is pivotljointed to lever f, which is hinged to the upper side of said reservoir and extends horizontally across the same through partition A2, and is provided at its outer end with or attached to a spiral spring, K, which extends downward to cross-piece M of the frame, and is secured thereto. Attached to said crosspiece is a vertical upright, N, which is provided at its upper end with a horizontal pivot, g, upon which is tted an L-'shaped lever','O. To the end of the lower and horizontalportion of said lever is fitted an anti-friction-wheel, P, which traverses the periphery of a cam-wheel, Q, on shaftlB, whereby the upper end of said lever receives an oscillating movement. Attached to said partition at or near the upper end of leverO is a rock-shaft, R, which communicates with said lever and lever f of the reservoir. Thus, as said lever i O is moved backward by the action of cam-wheel Q, valve d is raised upward, and the cylinder of the press is iilled with water preparatory to an outward movement of the piston S of the press. Attached to the upper end of said lever O is a pitman, T, to which is connected a horizontal slide, U. Said slide moves in guides or ways recessed within said partition, and is attached at its outer end to the center of buckle-jointed levers V V', the upper ends of which are hinged or jointed to the top portion of the frame, and at their lower ends to the upper or moving die-block, W.

Thus, as the upper end bf said lever O is tilted backward by the cam on wheel Q, said die-block is raised vertically by the traversin g of wheel P upon the annular surface of camwheel Q, and', as said wheel P passes over the inclined surface of the cam, lever O is tilted forward by the recoiling of spring K2, which is attached to the end of said pitman and to the side of the frame, whereby said levers V V are thrown to a vertical position, thus forcing die-block W downward against the upper side of the lower die-block, W2. Said block 72 is hinged to the frame in a manner admit-A ting of an automatic reciprocal movement with block W.

Attached to the outer side of said block W2 is apitman, T2, which extends obliquely downward, and is hinged to the outer end of lever 02 on rock-shaft B2.4 Said shaft. is supported by suitable bcarin gs secured to the lower portion of the frame. Attached toV the inner end of said shaft is a vertical lever,.Y, which is provided at its upper end with an anti-friction wheel, P2, which'traverses the side ofthe rim of cam-wheel D2 on shaft B. The arrangement of said cam is such as to tilt the outer end of lever O2 downward when v die-plate W is at its highest vertical position adjusted by the action of cam-wheel Q. Thus die-block V2 is tilted automatically forward from a horizon tal to a vertical position..

Fixed to the outer side of guide F of the pump-plunger is a pivot, h, which extends through slots t' cut vertically in the upright. of the frame. Upon said pivot, at or near its outer end, is a cross-head, l, secured thereon by means of nut m. Fixed upon the end of said cross-head are auxiliary wheels u u, so arranged as to traverse upon said upright, the object of which is to impair the downward movement of the pump-plunger as cam D recedes from lever E.

Attached to die-block W2 is a gage, l?, so arranged as to admit of being adjusted to any desired'point, and firmly secured in position by means of collar and set-screw s, the object of which is to govern the length of bolt.

Piston S of the press comes in contact with and against slide E2, which receives the heading-tool. Said slide moves in guides 0 o, secured to partition A2 of the frame. Secured to said slide is a collar, as, to the outer end of which are attached pitmen l and 2. Said pitmen extend horizontally outward through guide r, fixed to the upright of the frame, and

are provided at their outer ends with a crosshead, G2, to which is pivoted spring H2, said spring forcing the piston of the press backward as the pump-plunger` recedes, bringing said crosshead in contact with or against setscrew I), secured inthe lower end of bracket C, whereby the thickness of the bolt-head is governed, as the stroke of the press-piston is in all cases the same from its starting-point, said starting-point being regulated by the length of set-screw, whereby the distance between the en d of the heading-tool and shoulder of the header is increased or diminished, as required; or the same may be adjusted by means of a collar on the outerend of the piston which comes against the end of the cylinder of the press, said collar and piston being screwthreaded to admit of an easy adjustment.

The reservoir of the press may be supplied with water by means of suitable pipes leading from a second reservoir or from a hydrant. (Not shown in the drawing.)

In arranging the machine for the heading of different-sized bolts, the centralor shaping portion of the dies are changed, being fitted into a dovetailed recess in the main die-blocks, which admit of the same.'

The operation of our machine is as follows: The iron of which the bolt is made, being properly heated, is placed in die W2, and power is then applied to pinion C2, which communicates with lever O through the medium of camwheel Q and gear-wheel C on shaft B, allowing wheel l? of said lever to pass the cam. Said lever is then tilted forward by means of spring K2, forcing die-blockv W downward by the action of slide U and levers V V', thus upholding thevbolt between the compressible sides of the dies. Cam D of shaft B is then thrown in contact with or against jointed lever E, forcing plunger G into the pump, whereby the pressure of the water is thrown against piston S of the press, forcing heading-tool F2 into the die. Thus the bolt is upset and pressed to proper shape, forming the head. As the required amount of pressure is received upon the bolt escape-valve d is raised and the water escapes into reservoir J. Heading-tool F2 and piston S are then withdrawn by means of spring H2. As cam D recedes from lever E die-block W is adjusted. Lever O2 is then tilted downward by the action of cam-wheel D2 against wheel P2 of said lever, which cornmunicates with die-block W2 by means of pitman T2 tilting the same to avertical position, and the bolt is discharged from the machine.

Having thus described the nature and object of our invention, what we claim as new, and desire to secure by Letters Patent, is

1. The combination of die-blocks W W2, levers V V', pitman T2, lever O2, and rockshaft B2, all constructed and arranged as described.

2. The combination of the U-shaped spring H2, cross-.head G2, bracket C, pitmen 1 2, the collar-arms X, and header F2, when arranged substantially in the manner and for the purpose specified.

The above specification of our invention signed by us this 1st day of September, 1870.

THOMAS HULL. NICHOLAS THOMAS.

Witnesses G. H; Faos'r, E. A. ELLswoR'rn. 

